Category Archives: any general

enable duplex printing

Our Student Users don’t have admin rights. So it was necessary to adapt the [UsedPrinterName].ppd file. And set the Value from  DefaultAPOptionalDuplexer: False to True.


sed -i '' 's/*search_string/*replace_string/g' /path/to/file.extension

-i ”” edit the changes into the same file (there is a blank between -i  and the double empty quote!

############ change duplex 
Printer_X=$(less /private/etc/cups/ppd/Printer_X.ppd | grep "*DefaultAPOptionalDuplexer: False")

    if [ "$Printer_X" == "*DefaultAPOptionalDuplexer: False" ] 
        echo "change Printer_X to duplex"
       	sed -i '' 's/*DefaultAPOptionalDuplexer: False/*DefaultAPOptionalDuplexer: True/g' /private/etc/cups/ppd/Printer_X.ppd
    	echo "not needed"


I use this within a login script triggered with Jamf (Loginhook). This was the only working solution I have found to enable in school lab environment.

CURRENTUSER=$(/usr/bin/python -c 'from SystemConfiguration import SCDynamicStoreCopyConsoleUser; import sys; username = (SCDynamicStoreCopyConsoleUser(None, None, None) or [None])[0]; username = [username,""][username in [u"loginwindow", None, u""]]; sys.stdout.write(username + "\n");')
su "$CURRENTUSER" -c "defaults write /Users/ws/Library/Preferences/.GlobalPreferences AppleShowAllExtensions -bool true" 
su "$CURRENTUSER" -c "killall Finder"

Tested on MacOS 10.14.5 / 10.14.6

Little Engineer – first use

Little obstacles with fun”

My six-year-old son, was the first tester.  He did quite well. And played in the first attempt at level 20.


We had difficulties with the engineer blocks. Since we did not know when these were detected. But after an acclimatization phase everything went quite well.


Drag and drop program elements like turn left, right, go, … is not easy at times. But my son has not stopped playing the game.


He had the greatest fun as the alien has eaten the others.

The difficulty increases with time. As more and more features are unlocked.

Little Engineer – Unboxing

The surprise package has arrived!

(I received no email notification)


Putao Technology Inc.

little engineer
surprise surprise a little engineer kit is in the box 😉

´first look
first look

storage boxes (one for the blocks and the other for the iPad holder and the camera mirror)

iPad holder

engineer blocks
engineer blocks

fully built and ready to the use

ready to use

At the first look, everything fits together perfectly. I use an old iPad2. Little Engineer is compatible with iPad 2, iPad 3, iPad 4m iPad Pro, iPad Air 1/2, iPad Mini 1/2/3/4.

All parts are made from high-quality materials, the kit has no plastic parts which break off, or has sharp edges.

the first impression is very positive

I‘m very excited when the kids will play the first time with the little engineer game.

Little Engineer Programming for Kids

Little Engineer is an augmented reality learning tool that bridges the gap between the physical and the virtual, providing kids with the engagement of a video game with the mental and tactile stimulation of a physical puzzle. 

Screen source  – copyright by Shawn Sheng

I backed the project on Indiegogo.

The summary how the children like the stuff, comes as quickly as possible 🙂


XBox Fitness is officially discontinued by Microsoft and will be shutdown in 2017

Make sure to comment about your displeasure on the official blog post:

Here the original announcement from Microsoft.

Here at Xbox feedback.

Many people are pissed because they posted that they bought the Xbox One console only for  Xbox fitness.

Please vote for that Microsoft reconsider their decision.

New update on the “Xbox Fitness Sunset“:

Updated on 7/5/2016 by Jennifer Paige to add:

We wanted to take a moment to update you all on how affected users will be credited for the changes listed above:

  • Every user that purchased Xbox Fitness content will be eligible to receive a credit in his or her Microsoft account for the value of the content purchased. Credits can be used to make purchases in the Xbox and Windows Stores.
  •  Credits will be deposited automatically into the accounts of Xbox Fitness users. An Xbox System Message will be sent at the time of deposit, viewable on Xbox One, or the Xbox on Windows application.
  •  Xbox Fitness users will receive their credit within 90 days and the credit will be available for use for one year from the day of deposit.
  •  The majority of Xbox Fitness users will receive the account credit directly in their Microsoft account. A small number of users, who including those who are not able to receive a deposit, will receive an Xbox system message with a code or some other form of equivalent value.
  •  As announced, beginning June 27, 2016 users will no longer be able to purchase programs and/or workouts. Xbox Fitness users who purchased workouts in the past will be able to play them until June 10, 2017